2D-LC User Guide 327
12 Maintenance
Replace Valve Heads
Replace Valve Heads (G1170A)
The following procedure shows installation only. To remove the valve, follow the
instructions in reverse order.
The following procedure exemplarily shows a valve head installation. For correct
capillary connections see Valve topology in the GUI.
The valve actuator contains sensitive optical parts, which need to be protected
from dust and other pollution. Pollution of these parts can impair the accurate
selection of valve ports and therefore bias measurement results.
 Always install a valve head for operation and storage. For protecting the
actuator, a dummy valve head can be used instead of a functional valve. Do
not touch parts inside the actuator.
For a correct installation of the valve head, the outside pin (red) must completely
fit into the outside groove on the valve drive’s shaft (red). A correct installation is
only possible if the two pins (green and blue) on the valve head fit into their
corresponding grooves on the valve drive’s actuator axis. Their match depends
on the diameter of the pin and groove.
The tag reader reads the valve head properties from the valve head RFID tag
during initialization of the module. Valve properties will not be updated, if the
valve head is replaced while the module is on. Selection of valve port positions
can fail, if the instrument does not know the properties of the installed valve.
To allow correct valve identification, power off the module for at least 10 s.
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